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FOOT OPERATED AIR VALVE - AIR VALVE
Foot operated air valve - Lift plug valve.
Foot Operated Air Valve
- direction control (forward/Reverse) is controlled by shifting accelerator pedal side to side. Allows the Operator the change directions without removing hands from steering wheel.
- A valve for bleeding air from water pipe
- A valve controlling the passage of air. Also a valve admitting air to a steam boiler, preventing the formation of a partial vacuum when the steam condenses.
- A valve mounted on top of a tank car through which air pressure (or other gas pressure) is introduced to facilitate unloading.
Plowing the Field
Until I saw this photo, it had never occurred to me that there could be such a thing as a foot-operated plow.
Despite the farmer's winning smile, I imagine this form of plowing must have been difficult and tiring.
I wonder whether this plow was used to supplement work done by oxen pulling plows, or whether it was limited to farmers who were too poor to afford an ox to plow their fields.
This photo is from an album Elstner Hilton compiled in Japan between 1914 and 1918. Elstner was my spouse's uncle.
While Uncle Elstner sometimes annotated photos that required an explanation, he never dated the pictures. So all we know is they were taken between January, 1914 and December, 1918.
The plow in this photo looks like it hasn't seen much use.
Steam foot switch
As part of the control on this 3 group. Both foot operated. Surprised to find that the steam wand articulation is more than say on a Synesso, but is less total tubing run length from boiler to tip
See also:
valve seat grinder
beryllium valve seats
api 6a gate valves
ball valve 3 way
butterfly valve symbol
china valves tech
automatic sprinkler valve
relief valve design
Post je objavljen 31.01.2012. u 13:00 sati.